Hemp and cannabis plants need water to grow and thrive, and yet your final products must be stripped of most of their moisture in order to guarantee safety. Overmoisturization can occur as a result of overwatering, high humidity or an ineffective curing process. This is especially a risk for plants that grow outside, which are more susceptible to environmental conditions. You’ll need to test your post-harvest hemp for water activity and moisture content because these are key factors that can indicate risks for microbial contamination.